First load the render node software on the other machines in the network, you don't need to load it on the host machine. Make sure you also install any plugins on the networked machines also. If you are using XP, the networked nodes will probably connect to each other automatically. When it comes time to render, you must first save your file. Then open the render node software on each machine. Then set up a batch render and enable "network rendering" on the host machine and then press "launch".